Quantity   Component name
1 × ACO Air Pump These cheap air pumps are found on AliExpress, usually having ACO in their name. They differ in sizes and air flow, choose one for your needs.
3 × KF301-5.0-2P Terminal Block Connector 2 or 3 of these are required depending on whether you want manual bypass switch or not
1 × SRD-12VDC-SL-C This relay does all the magic
1 × JST B2B-XH-A 2-pin JST XH wire to board connector is used to connect the 3018
2 × JST XHP-2 2 male JST XH connectors are required to make a control cable
1 × Single Pole Single Throw (SPST) switch Optional. Use any rated for the mains power for the manual bypass if you want it
1 × 3 ft of 18 AWG wire Used for mains power
1 × 1 ft of 22 AWG wire Used for the 12V
1 × 40×50 mm piece of single-layer 1 oz PCB To hold the circuit
1 × Spare socket (receptacle) Optional. If you decide to make a control block with a socket instead of directly connecting the pump to the controller